IfcRelVoidsElement

Natural language names
Abzug / Subtraktion von Teil aus Element - Relation
Rel Voids Element
Relation de percement
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelVoidsElement
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
IFC4 Addendum 2 4.0.2.0
    IfcRelVoidsElement
      RelatingBuildingElementXMODIFIEDXsdformat changed from Attribute to Hidden.
Semantic definitions at the entity
Entity definition

IfcRelVoidsElement is an objectified relationship between a building element and one opening element that creates a void in the element. It is a one-to-one relationship. This relationship implies a Boolean operation of subtraction between the geometric bodies of the element and the opening.

As shown in Figure 338, the insertion of a void into a wall is represented by the relationship IfcRelVoidsElement. The opening is created within the wall by IfcWall(StandardCase) o-- IfcRelVoidsElement --o IfcOpeningElement.

"relationships for voiding"

Figure 338 — Relationship for element voiding

HISTORY  New entity in IFC1.0

Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatingBuildingElementIfcElement Reference to element in which a void is created by associated feature subtraction element.
IFC2x CHANGE  The data type has been changed from IfcBuildingElement to IfcElement with upward compatibility for file based exchange.
X
6RelatedOpeningElementIfcFeatureElementSubtraction Reference to the feature subtraction element which defines a void in the associated element.
IFC2x CHANGE  The data type has been changed from IfcOpeningElement to IfcFeatureElementSubtraction with upward compatibility for file based exchange.
X
Inherited definitions from supertypes
Entity inheritance IfcRelDecomposes IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText? Optional description, provided for exchanging informative comments. X
IfcRelationship
IfcRelDecomposes
IfcRelVoidsElement
5RelatingBuildingElementIfcElement Reference to element in which a void is created by associated feature subtraction element.
IFC2x CHANGE  The data type has been changed from IfcBuildingElement to IfcElement with upward compatibility for file based exchange.
X
6RelatedOpeningElementIfcFeatureElementSubtraction Reference to the feature subtraction element which defines a void in the associated element.
IFC2x CHANGE  The data type has been changed from IfcOpeningElement to IfcFeatureElementSubtraction with upward compatibility for file based exchange.
X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelVoidsElement" type="ifc:IfcRelVoidsElement" substitutionGroup="ifc:IfcRelDecomposes" nillable="true"/>
 <xs:complexType name="IfcRelVoidsElement">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelDecomposes">
    <xs:sequence>
     <xs:element name="RelatedOpeningElement" type="ifc:IfcFeatureElementSubtraction" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelVoidsElement
 SUBTYPE OF (IfcRelDecomposes);
  RelatingBuildingElement : IfcElement;
  RelatedOpeningElement : IfcFeatureElementSubtraction;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElement IfcFeatureElementSubtraction

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